Connect two LANs on one PIX515UR --- Help, Please

I am sure this can be done but I am exhuasted and can't seem to figure this out. What I am attempting to get done is have eth 1 and eth 2 talk to each other. We have a Quickbridge 2 60 connection between two buildings that works fine if both building are on the 10.0.2.0 network, but I would like a to keep them on different networks. You see one of the proxims died a few weeks ago and I had to change all the IPs at the second building in order to get the L2L VPN working quickly and dont want to change the IPs again now that I have the working replacement proxim installed. so here is what I have got so far.
Site A (10.0.2.0) -- Proxim 1 (10.0.2.12) -- Proxim 2 (10.0.2.12) -- Site B -- PIX -- Eth2 (10.0.2.233) -- Eth1 (10.0.3.1) -- LAN at Site B (10.0.3.0)
BTW the Proxims have to both be on the 10.0.2.0
I think I need to do a VLAN but not sure or sure how to do it.
I hope this makes sense. Thanks

Can you post your PIX config? The PIX can definitly do it, just treat the other site as a DMZ and not lock it down. Cisco has a good DMZ example for the PIX 515 if you search their page. Your ACLs would just be "permit any any". In all honesty this situation is best covered by a router or layer 3 switch.

Ok I can connect from site b to site a but not the other way around. When I do get the connection up it hoses everything over at site a, kills internet, opening files on servers, basically shutdowns the whole network for some reason. here is the config again with what you tols me to add. Thanks.

Ok small change in direction but still the same concept I just need to know how to get eth 1 to talk to eth 4 back and forth. Below is my current PIX config. PS the config include my L2L VPN that will go away as soon as I can get eth1 and eth4 talking and eth4 is shutdown for now till I test in the mornings. Thanks.

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